Hi CaroC
Thanks for your post. AccountRight doesn't have the option of keeping track of lot numbers and expiry dates. I would recommend looking into our App Marketplace. These apps are developed by third parties, so I would recommend contacting them directly via their website. A quick search gave me a couple of options to add an expiry date to items.
Without an app you would look at having an item for each batch and each expiry date. This is not the most feasible solution as it would require you to have a long item list and you would have to create a new item for each new lot and expiry date.